#pragma warning(disable : 4996)
#include<iostream>
#include<graphics.h>
struct ListNode
{
	ListNode(int x)
		:
		next(nullptr),
		_val(x)
	{
		_val = 3;
	}
	ListNode* next;
	int _val;
};
int main()
{
	ListNode* n1 = new ListNode(1);
	free(n1);
	n1 = nullptr;


	return 0;
}